How to Fix the Brake Boosters on a Chevy Suburbanby Jeffrey Caldwell
The brake booster also know as a power booster on a Chevrolet Suburban is a circular steel piece mounted on the firewall behind the master cylinder. The brake booster utilizes vacuum created by the engine to increase the amount of force generated when the driver presses on the brake pedal. The brake booster also lessens the distance the brake pedal must travel before the brakes are engaged. If you notice that the brakes on your Chevy Suburban's brakes lack the power they once had, or it feels like the brake pedal travels further before engaging the brakes, your brake booster might need to be replaced.
Removing the Brake Booster
Locate the brake booster on the driver's side of the firewall inside the engine bay. It will be just behind the brake master cylinder.
Disconnect the vacuum line from the power booster by loosening the retaining clamp. Pull the line off the brake booster.
Remove the two bolts that connect the master cylinder to the power booster. Be careful not to put any stress on the brake lines connected to the master cylinder. Slide the master cylinder forward and secure the master cylinder so it is not resting on the brake lines.
Disconnect the brake pedal pushrod from the brake pedal (from inside the passenger compartment) by removing the retaining clip and disengaging the pushrod from the pedal.
Remove the four nuts and bolts that connect the brake power booster to the vehicle's firewall. Then remove the booster from the vehicle.
Installing a New Brake Booster
Place the new brake booster into position on the firewall. Carefully guide the brake booster pushrod through the hole in the firewall.
Reinstall the four nuts and bolts that secure the brake booster to the firewall.
Reconnect the brake pedal pushrod to the brake pedal. Reinstall the retaining clip that secures it.
Push the master cylinder back into position against the brake booster. Be careful not to stress the brake lines that are attached to the bottom of the master cylinder. Reinstall the two bolts that connect the master cylinder to the brake booster.
Reconnect the vacuum line to the brake booster by sliding the rubber hose over the input fitting. Reinstall the retaining clamp that holds the line on the fitting.
- check The brake booster requires special tools to service it. It is usually advisable to simply replace the unit, instead of trying to service it.
- close Do not remove the brake lines from the master cylinder. Doing so will introduce air into the hydraulic lines and then the brakes must be bled to ensure safe operation of the vehicle.